Pollen Count & Forecast for Cincinnati

Cincinnati’s spring allergy season (March-May) is dominated by Maple and Oak pollen; Maple (Acer) is common in Eden Park and Ault Park; Oak (Quercus) is found throughout Mount Airy Forest. Ash (Fraxinus) contributes significantly from larger regional parks. Summer and autumn (May-October) see high Grass (Poaceae) and Ragweed (Ambrosia) pollen levels, originating from hillsides and along Ohio River riverbanks.

The Ohio River valley geography traps pollen; humid air holds allergens in low-lying basins. Autumn and winter see elevated Mould (Alternaria, Cladosporium) spore counts, from decomposing leaf litter in wooded hills and damp urban environments.